At first I thought it might be a bit overpowered since the 6pc bonus makes it unlimited damage, but as I read through, the op makes some good points about how it actually wouldn't be as over powered as it sounds.
For those that don't want to click the link here's the bonus idea:
2pc bonus: Increases Arcane Power Regeneration by 4.00 per Second
4pc bonus: Your channeling damage increase remains for 2 seconds after you move
6pc bonus: The maximum damage cap of your channeling skills is now unlimited
As he says, it could bring Aether Walker into the mix as a very solid weapon choice even though it has been regarded as a bounty/speed rift only weapon...